Elsevier

Phytochemistry

Volume 21, Issue 5, 2 June 1982, Pages 997-1008
Phytochemistry

The effect of some oligo-amines and -guanidines on membrane permeability in higher plants

https://doi.org/10.1016/S0031-9422(00)82404-8Get rights and content

Abstract

The effect of a series of oligo-amines and -guanidines on the membranes of higher plants has been tested by measuring the efflux of betacyanin from beet root discs, and the loss of total ions from beet root and swede discs, beet and spinach leaf discs and apple cells in suspension culture. All of the naturally occurring di- and polyamines tested showed relatively little toxicity. Betacyanin efflux from beet root discs was reduced by diamines [NH2(CH2)xNH2] up to x = 10 or less. Ion efflux was minimal at x = 7. Within the triamine series [NH2(CH2)xNH(CH2)3NH2] for x = 8 or less, betacyanin efflux was reduced or unaffected, although total ion loss was increased by the triamines when x = 4 or more and especially by the longer chain amines (to x = 10). Similar behaviour was found in the tetra-amine series [NH2(CH2)3NH(CH2)xNH(CH2)3NH2] with betacyanin efflux reduced for x = 2–4 (spermine). Although spermine potentiated the toxicity effects of Guazatine {[NH2C(NH)NH(CH2)8]2NH} and Dodine [NH2C(NH)NH(CH2)11,Me] in beet root discs, spermine and calcium ions reduced the ion efflux caused by these toxic guanidines and also by Synthalin B [NH2C(NH)NH(CH2)12NHC(NH)NH2] in swede discs, spinach leaves and apple cells. No significant reversal of ion loss was detected with putrescine, cadaverine or spermidine in swede discs. In the homologous series of monoguanidines [NH2C(NH)NH(CH2)x−1Me] for x up to 18, greatest toxicity was shown for x = 10 and 11 in both betacyanin loss and total ion efflux in beet root discs. Greatest ion efflux from the apple cell suspension was found with x = 11 and 12. In the homologous series of diguanidines [NH2C(NH)NH(CH2),NHC(NH)NH2] for x = 2–12 greatest toxicity was shown for x = 12 (the longest chain tested) in beet root and in the efflux of ions from apple cell suspension. Technical Guazatine was considerably more phytotoxic than pure Guazatine in all systems tested. p-Chloromercuribenzoate (p-CMB) potentiates the loss of betacyanin and total ions caused by Guazatine, Synthalin B, and Dodine in beet root discs. This effect of p-CMB is reversed by subsequent incubation in cysteine or mercaptoethanol, prior to treatment with the guanidines.

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    Present address: Biochemistry Department, M.S. University of Baroda, Baroda, India.

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